TY  - JOUR
AU  - Stock, C.
AU  - Rodriguez-Rivera, J. A.
AU  - Schmalzl, K.
AU  - Rodriguez, E. E.
AU  - Stunault, A.
AU  - Petrovic, C.
TI  - Single to Multiquasiparticle Excitations in the Itinerant Helical Magnet CeRhIn $_{5}$
JO  - Physical review letters
VL  - 114
IS  - 24
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-04672
SP  - 247005
PY  - 2015
AB  - CeRhIn5 is an itinerant magnet where the Ce3+ spins order in a simple helical phase. We investigate the spin excitations and observe sharp spin waves parameterized by a nearest-neighbor exchange, JRKKY=0.88±0.05  meV. At higher energies, the spin fluctuations are heavily damped, where single-quasiparticle excitations are replaced by a momentum- and energy-broadened continuum constrained by kinematics of energy and momentum conservation. The delicate energy balance between localized and itinerant characters results in the breakdown of the single-quasiparticle picture in CeRhIn5.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000356484700004
DO  - DOI:10.1103/PhysRevLett.114.247005
UR  - https://juser.fz-juelich.de/record/202458
ER  -